5) If the origin O and the points A(1, 2, 3), B(2, 3, 4) and, P(x,y,z) are coplanar then

14) If the four points A(2-x, 2, 2), B(2, 2-y, 2), C(2, 2, 2-z) and D(1, 1, 1) are co-planar, then

16) Points A(4, 5, 1), B(0, -1, 1), C(3, 9, 4) and D(-4, 4, 4) are

23) If the points (-1, -1, 2) , (2, m, 5) and (3, 11, 6) are collinear, then the value of m is

34) The moment about the point M (-2, 4, -6 ) of the force represented in magnitude and position AB, where the points A and B have the coordinators (1, 2, -3) and ( 3, -4, 2 ) respectively is

42) A tetrahedron has vertical at

O (0, 0), A ( 1, 2, 1), B (2, 1, 3) and

C ( -1, 1, 2). Then, the angle between the faces OAB and ABC will be

65) The volume of the tetrahedron formed by the points (1, 1, 1), (2, 1, 3), (3, 2, 2) and (3, 3, 4) in cubic units is: